What characteristic defines the Sans Serif B-point alphabet?

The Sans Serif B-point alphabet is defined by its classification as a monoline manuscript. This means that the letters are formed with a uniform stroke width, without variations in thickness. This characteristic contributes to a clean and modern appearance, which is one of the defining traits of sans serif typefaces. In whereas serif typefaces have decorative strokes (serifs) at the ends of letters, the sans serif style is characterized by its straightforward simplicity and legibility, making it popular for various designs, especially in settings where clarity is paramount.

In contrast to this correct answer, the other options describe attributes that do not apply to the Sans Serif B-point alphabet. The mention of varying letter thicknesses does not fit because san serif fonts are designed to maintain a consistent stroke. Cursive writing is characterized by flowing, connected letters, which is a different style altogether from monoline forms. Lastly, decorative embellishments run counter to the minimalist approach of the sans serif style, as such embellishments would typically imply a more ornate design which would not be present in a monoline manuscript. Therefore, recognizing the monoline aspect is essential in accurately identifying the nature of the Sans Serif B-point alphabet.